You can locate an Army Reserve unit through the official United States Army Reserve website. As of 2015, click on the Commands tab on the home page at www.usar.army.mil. Select among Operational/Functional, Support and Training commands for lists of commands. Contact the specific command for individual unit information.
Each command page lists its units in the side menu. Each unit page provides information on the structure, commanders and history of the unit, along with a news feed of current events.
The U.S. Army Reserve maintains headquarters in Fort Bragg, North Carolina, and operates under the direction of the Chief, Army Reserve at The Pentagon in Washington D.C.